Yes everything needs to be washed and many choose to sanitize as well. The rack needs to have the upper surface of each level (where the snake contacts it) also washed and sanitized too I find laying on my back and working behind my head the best I use a scrubby/sponge and then spray sanitizer and then wipe dry after the appropriate time for most chemical sanitizers (usually 20-30 min)

I would not randomly spray a carcinogenic chemical around my home with out good reason. never forget that is a slightly different form the active ingredient was developed to kill snakes on Guam. It needs to be treated with the care it deserves and not casually sprayed about indiscriminately.