Sure. Zep Purple is nasty stuff. You don't want to breathe it. Having said that, I find that it is an excellent choice for cleaning tires. It will remove the brown junk like nobody's business. ARO is also great for that, but costs much more. ZP is available locally with no shipping costs for a very reasonable price. Zep Citrus, by comparison, is a great cleaner too, but just doesn't have the same effect on tires. It does a great job on well and wheels. For me, it's like having a specific tool for each area. I actually ran out of ZP tonight on a 7 series I'm working on and used OPC instead. Not as good although I will sometimes follow up the ZP with it for a 2nd scrub if they're really bad. A 2nd shot of ZP would do fine too but I bought 2 gallons of the OPC when it was on BOGO a while back and am looking at ways of using some up.
