I came across this the other day and a huge light bulb went on over my head! I have a Swiffer Wet Jet but hardly ever use it because the cloths are so expensive, and so is the cleaner at goes inside.
No tutorial here, just cut an old cloth diaper to the correct size, attached the loop side of the Velcro with a zig zag stitch and WA LA, a Swiffer pad that works perfectly and goes in the washer.
For the cleaning solution I use a homemade 409 in a squirt bottle. I have laminate floors and it works really well. Here's the recipe for the 409 if anyone is interested. I have not bought any other cleaner for my bathroom or kitchen in years. It even works on windows or mirrors.
2 tbl spn vinegar
1 tsp borax
1/8 cup of dish soap
Mix in a spray bottle and shake.