My 2001 Casita
was a chalky streaky mess. I tried several things, but finally cleaned it with Bar Keepers Friend, powdered type and a blue scrubby that is for Teflon products. It was amazing how much nasty it cleaned off. My trailer even had mold/mildew on it. It had sat stored outside for a long time before I bought her.
Rinsed very well and the second day I applied one thin coat of PolyGlo, by the time I was finished with the first coat was dry I could reapply. I did a total of four coats.
I could see myself in the pure white sparkling surface.
I am a seventy year old lady, and this job was totally within my grasp. My friend had her Scamp
done professionally and it was no comparison to the finish on my Casita
This year I will clean and apply another coat of Poly Glo. Think it has been two years since I initially did this job and I can still see reflection in it.