clean dry surfaces-- you could wipe alittle 3 in1 on the body--- anything that squeezes itself
amongst the cogs could be worse than you think and mix with other chemicals used for lubrication-- in the moisture a big mess-- make sure your cassette is clean, fresh, and tightly bound....
I use aluminum spacers-- not plastic and a steel lock ring... not aluminum....most lock rings have
a wafer thin anti-sieze shim-- I take that off and use a touch of white grease... my2$