I do submerge the entire flat mop thing in a bucket, I generally fill it with a few litres of water and a bit of the detergent, and then wring that out really well. I like to hoover before, but I always get a lot of dirt on the pad. If there's a spill or something, I put water plus a tiny bit of the detergent in a spray bottle, spritz on the area and wipe it with either a cloth or the flat mop, but for doing the whole thing, I like the bucket better, even though it's a bit of a hassle, as I imagine the floor isn't getting clean otherwise.