As above , our alkali cleaner is lithofin intensive cleaner, which can break down polymer in cases. Grimex mention above ,I think is an alkali this may do if you have some.
Again dilute , pad on with pad, let the product work 10-12 min , scrub every min , rinse
Got ant photos of this contamination
Again dilute , pad on with pad, let the product work 10-12 min , scrub every min , rinse
Got ant photos of this contamination