Cleansing Foam (BTDB2)

"Sprays foam that removes Camo and Regrow and pops Lead bloons."

- BTDB2 description

Cleansing Foam is the 3rd upgrade on Path 2 of the Engineer Monkey in Bloons TD Battles 2. It is similar to its BTD6 counterpart, except foam is automatically locked on Close and also strips Lead properties off DDTs. Foam also removes Camo and Regrow, as usual.

It costs $800.

Summary
Cleansing Foam's decamo and degrow is helpful for removing Camo and Regrow properties off a small number of bloons, and its lead-stripping against DDTs proves to be helpful for weakening these bloon types. However, foam has limited pierce, a lot lower than other decamo options such as Submerge and Support and Shimmer, which can cause it be overwhelmed easily.

Tips

 * 2-3-0 is usually better than 0-3-2, given the higher refreshment rate of foam while also having extra DPS with the Engineer's sentries.
 * Being locked on Close, one can just place down a Cleansing Foam Engineer and expect reliable placement of the foam. It is best placed along a section where DDTs and regular Camos may come out, normally somewhat close to the entrance.

Trivia

 * Out of all upgrades, this was the first upgrade ever able to remove (different from granting normal type to towers, such as MIB) a type immunity, as all other upgrades can only remove camo and regrow. Shattering Shells received a buff in Version 1.0.4 that also lets it de-lead, like Cleansing Foam.