Cleanse is a self-targeted summoner spell. Its primary function is to remove active crowd control effects, allowing the summoner to continue pursuit or escape.

Strategy

  • Cleanse Cleanse will remove the following:
  • Cleanse Cleanse will provide 3 seconds of 65% Tenacity after activation, stacking multiplicatively with other sources.
    • This crowd control reduction will have no effect on additional Ignite Ignites but will reduce the duration of movement speed slows from additional Exhaust Exhausts.
  • Cleanse Cleanse is disabled while Suppression icon Suppression, nor will it affect the duration if activated prior.
  • Note that while Cleanse Cleanse is enabled for casting during Airborne icon Displacements, it will not have any effect. Unlike other cleansing effects, such as Remove Scurvy Remove Scurvy, Cleanse Cleanse cannot be combined with Flash Flash (or any dash) to break free of a displacement.
  • Self-CC is merely described as such for flavour and is not truly classified as crowd control. Cleanse Cleanse will neither remove or reduce the duration of self-applied effects.
  • If equipped with the rune Unflinching rune Unflinching, activating Cleanse will grant:
    • 73.225% Tenacity for the first 3 seconds.
    • 23.5% Tenacity for the next 7 seconds.
    • 10% Tenacity afterwards, until Cleanse is off cooldown.

Notes

Summoner spell CDR
Base cooldown ▶ 300s
(FlashTeleport)
240s
(ClarityHeal)
210s
(CleanseExhaustIgnite)
180s
(BarrierGhost)
75s
(Smite)
80s
(Mark)
Cooldown reduction icon Cooldown reduction
5% (Cosmic Insight rune) 285s 228s 199.5s 171s 71.75s N/A
10% (Ionian Boots of Lucidity item) 270s 216s 189s 162s 67.5s N/A
15% (Ionian Boots of Lucidity itemCosmic Insight rune) 255s 204s 178.5s 153s 63.25s N/A
25% (Unsealed Spellbook rune) 225s 180s 157.5s 135s 56.25s N/A
30% (Unsealed Spellbook runeCosmic Insight rune) 210s 168s 147s 126s 52.5s N/A
35% (Unsealed Spellbook runeIonian Boots of Lucidity item) 195s 156s 136.5s 117s 48.75s N/A
40% (Unsealed Spellbook runeIonian Boots of Lucidity itemCosmic Insight rune) 180s 144s 126s 108s 45s N/A
40% (Howling Abyss icon) 180s 144s 126s 108s N/A 48s
43% (Howling Abyss iconCosmic Insight rune) 171s 136.8s 119.7s 102.6s N/A 45.6s
50% (Howling Abyss iconIonian Boots of Lucidity item) 150s 120s 105s 90s N/A 40s
52.5% (Howling Abyss iconIonian Boots of Lucidity itemCosmic Insight rune) 142.5s 114s 99.75s 85.5s N/A 38s
55% (Howling Abyss iconUnsealed Spellbook rune) 135s 108s 94.5s 81s N/A 36s
58% (Howling Abyss iconUnsealed Spellbook runeCosmic Insight rune) 126s 100.8s 88.2s 75.6s N/A 33.6s
65% (Howling Abyss iconUnsealed Spellbook runeIonian Boots of Lucidity item) 105s 84s 73.5s 63s N/A 28s
68% (Howling Abyss iconUnsealed Spellbook runeIonian Boots of Lucidity itemCosmic Insight rune) 96s 76.8s 67.2s 57.6s N/A 25.6s

Trivia

  • The tooltip previously stated that Cleanse Cleanse was able to remove the Sleep debuff, though no such effect has ever existed in the game.
  • Cleanse Cleanse was named Boost up until V0.9.22.15.
  • Prior to V3.13, Ground Slam Ground Slam and Barrel Roll Barrel Roll were the only attack speed slows in the game not connected to a movement speed slow and so were the only attack speed slows that Cleanse Cleanse did not remove.


Patch History

V7.22
  • Level requirement increased to 9 from 6.
V5.18
  • Now removes Challenging Smite Challenge / fixed a bug where Cleanse wasn't removing all Summoner Spell debuffs.
V4.1
  • Icon updated.
V1.0.0.139
  • Fixed a bug where it could interrupt Teleport Teleport.
V1.0.0.129
  • Now cleanses summoner spell debuffs such as Exhaust Exhaust's movement speed and damage reduction and Ignite Ignite's damage over time.
  • Cooldown increased to 210 seconds from 150 seconds.
  • Improved Cleanse no longer reduces cooldown, but now extends the secondary disable reduction buff by 1 second.
V1.0.0.125
  • Removed the word "sleeps" from tooltip.
V1.0.0.104
V1.0.0.99
  • Now removes silence and blind effects.
V1.0.0.97
  • Can now be used without breaking stealth.
V1.0.0.96
  • Now only removes crowd controlling effects, silences and blinds. It no longer removes effects such as damaging debuffs or armor/stat debuffs
V1.0.0.86
  • Cooldown increased to 150 seconds from 120.
V1.0.0.72
V1.0.0.63 Remake
  • No longer provides debuff immunity (but still removes debuffs when cast). Provides a 50% duration reduction to stuns, slows, taunts, fears, snares, sleeps and immobilizers for the next 3 seconds.
  • Cooldown increased to 120 seconds from 100.
  • Willpower (mastery): Cooldown reduction reduced to 20 seconds from 30.
V1.0.0.61
  • Now provides 2 seconds of debuff immunity after cast.
V0.9.25.24
  • Cooldown reduced to 100 seconds from 120.
V0.9.22.16
  • Added the summoner spell particle.
  • No longer stops Requiem Requiem.
V0.9.22.15 Remake
  • Renamed to Cleanse from Boost
    • Removes all debuffs from your champion, can be cast while disabled.
    • Cooldown reduced to 120 seconds from 150.
V0.9.22.7
  • Cooldown increased to 150 seconds from 120.
  • Duration reduced to 12 seconds from 15.
July 10, 2009 Patch
  • Duration reduced to 15 seconds from 30.
June 26, 2009 Patch
  • Will Power (mastery): Increases the duration of Boost by 2 seconds, and reduces the cooldown by 30 seconds.
  • Is no longer gets consumed by autoattack abilities like Frost Shot Frost Shot or Toxic Shot Toxic Shot.


June 6, 2009 Patch
  • Gave it the correct buff icon/tooltip.
  • Can now be cast while disabled.
May 29, 2009 Patch
  • Tooltip fixes.
May 23, 2009 Patch
  • Now activates a 30 second duration spell shield (90 secong cooldown), also removes any slows/silences/snares currently on the caster.
May 1, 2009 Patch
  • Cooldown reduced to 90 seconds from 180.
  • Known issue: it doesn't break stuns, fears, or silences.
Alpha Week 5
  • Initial cooldown reduced to 0, and cooldown reduced to 180 seconds from 480.
Alpha Week 4
  • Cooldown reduced to 360 seconds from 480.
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