If you REALLY want to strip old paint/grease/rust off, I'd get a Hotsy if I were you. They heat up a mildly caustic solution and spray it on under pressure. It's practically the origination of the phrase "Steam Cleaner". You can rent these units too. They clean much better than those cheap pressure washers. You have to wear protective gear when using them, because they do a pretty good job removing flesh also.