how to clean mold… deep chest freezer?

just got this deep chest freezer and let it sit in my basement for a couple of months unplugged with the lid closed and looked in there today to find mold ring all over the inside bottom. i know bleach will kill the mold, but any other suggestions on get the smell out. also, will the mold come back? will i have to defrost it every so often?

we got the freezer on freecycle (for those who dont know, its an awesome site, so we dont have like the instruction manual or anything.

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