F
Fliselege
Well some tiles are only 6mm thick so a 5mm gap should be fine, but best to get as much out as possible to be sure of a solid finish. I wouldn't wet up the lines before starting the grout, can see that being more of a hinderance than a help, just go over the lines with a dry paint brush if you think it will help. If you really want to wet wash it out, let it dry 101% before you grout.
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