murphy's soap should do the trick
Often, poly will not adhere due to contaminants on the surface. Remove all of the loose coating, sand the surface, brush off the surface with a brush, then remove the remainder the dust with a tack cloth.
sand it
Use acetone.
something slow working with a rag, I.E. fast srying reducer or a degreaser but work fast. Then you will probably have to buff and polish
How you can best clean up spilled polyurethane will depend on where it is spilled. If it is spilled on a laminate floor, rags dampened in mineral spirits will work well. If the spill is on concrete, paint thinner will clean it up.
Polyurethane will give a long lasting easy to apply finish. Use a water based polyurethane ans clean up will be much easier. You should get years of wear from a good polyurethane finish.
Befor applying polyurethane, you need to sand the wood smooth, clean it and if wanted putty the holes.
Yes, but be careful of fumes, it can affect you
No, in fact the wax can ruin the polyurethane finish. Clean the floor with a good wood floor cleaner. Do not mop with water.
You can remove stains or blemishes from a polyurethane watch by scrubbing it with a wet terrycloth that has been dipped in a solution of warm water and liquid dish soap. For tough stains, dip a melamine foam sponge into the solution, ring out and wipe the watch gently. Dry well with a clean towel.
You can use a vinegar and water mixture. Or mineral spirits.
It means to clean some surface, usually from a liquid or dust, using a cloth or something similar.