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 can be removed by sanding, chemical application, or by licking the fan before turning it on to increase the required ventilation. 
( z1 possible :ARG1 ( z2 remove :ARG1 ( z3 varnish ) :manner ( z4 or :op ( z5 sand ) :op ( z6 apply :ARG1 ( z7 chemical ) ) :op ( z8 lick :ARG1 ( z9 fan ) :time ( z10 before :op ( z11 turn-on :ARG1 z9 ) ) :purpose ( z12 increase :ARG1 ( z13 vent :ARG1-of ( z14 require ) ) ) ) ) ) )