Wet cleaning generally reduces static. However, if you dry a disk with a microfibre cloth you may introduce static then. I don't worry about it as I always treat a record before playing it with either a Zerostat gun or, lately, the Furutech Destat III.
As for your question about a Spin Clean, U/S and vacuum machine for <$500, you'd need to find some used bargains and I don't think you'd easily come in under budget! You could get a Humminguru for $375USD. Once you have tasted the convenience of a machine it is hard to clean manually, unless you are as saintly as pindac! But a Spin Clean is relatively cheap and if you don't mind the effort there is little to lose by trying it out.