How to remove varnish<br>Create good ventilation. Whether your sanding or using a chemical solvent, it's a good idea to have ventilation. Open windows and use fans to create cross-ventilation if you're inside.
Varnish removal is affected by the usage of cross-ventilation. 
( z1 affect :ARG0 ( z2 use :ARG1 ( z3 filter :ARG1-of ( z4 cross ) ) ) :ARG1 ( z5 remove :ARG1 ( z6 varnish ) ) )