Using wet and dry paper (a Q for Neil)

I have recently been using wet and dry paper with soapy water to sand a polyurethane finish (yes I know I shouldn't use polyurethane but it suits the purpose, just this once). I have been following the instructions in The Great Book but even after a good clean the sludge is left as a coating when the piece dries. The only way I have been able to solve this is to go back and sand dry which seems to defeat the purpose of using wet and dry. The finish is just a described in the bood but I seem to have added an unnecessary step. Any advice would be appreciated.

Clean soapy water should remove it. It will allways dry with a haze which can look like dry sludge.

I was going to answer, but seeing as the question was only directed at Neill, I'll leave it to him..... https://www.ubeaut.biz/chuckle2.gif

You could be waiting a little while for Neil.

He is in the throes of moving both house and business.

I have used the same method in the past & have found that I needed a second bucket with clean water and a rag to wipe down with.
I gave up on that method when one day, I impatiently had at the job with the ROS & some fine sterate coated paper I found tha I got the result faster.
One point is that whatever you do You must wait for the poly to harden off enough. So the best you can hope for is one coat a day, in cold weather It might take more than 24 hours for the poly to go off properly.
cheers