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Old Mod
Yeah I can't deny that happens on occasion mate, but I'll sponge it off straight away. And I don't use Mapei anything if I can help it. Although at one point, Mapei grout was all I used, it's the most available product in London, so I don't mind using it and I can keep it on my squeegee hahaYou can try and work clean as possible but there is always that sneaky blob of addy or you could just be working with Mapei grout........... IMO!
And somehow I was always able to convince my clients th have the same colour walls and floors, problem solved. Haha sorry