[Arran]

Ron;
  Are there none of the yellow (or blue) rubber gloves to be found in the local supermarket's cleaning products section? If there are I would give those a try, I used those with paint and varnish remover and never had any problems.
  As for the problems with getting paint off, get some of the old fashions paint and varnish remover, with methylene chloride, it's sold under several brands, such as Polystrippa. Here is one sold under the Watco brand at Walmart, claims that it will remover polyurethane:

https://www.walmart.com/ip/Watco-Paint-a...t/48810140

 Use this stuff, and you probably won't have to go back for a round two on those cabinets, the longer you leave it on the more it will take off, use a stiff brush and wood chips to remove the residue in the cracks and moldings. Then follow it with a wash of acetone to get rid of anything that's left.
Regards
Arran