It was probably the "cotton rugs". Rags are recommended.

"Sasha" wrote in message
oups.com...
I rubbed MinWax Wipe-On Poly over stained pine and it got bad. I have
now several places with white muddy polyurethane spots. I don't know
why this happened and how to fix this. I followed instructions on can
and use cotton rugs. any help would be appreciated.