Worst I've ever had was gloss on Artex making totally waterproof Artex, ended up melting it off with a heat gun.
Woodchip has never been too much of a struggle as scrapping off the bumps allows the water/steam to soak in (I've used a surform before now). Adding washing up liquid to water helps it to stop drying off so makes a good solution to soak with.
A couple of good soaks over previous days after scraping off the bumps helps.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates