Interesting observation that I had was that Pinnacle Micro Rejuvanator smells exactly like the cleaner that comes with the kit to clean and re-oil your K&N air filters.
Costco sells gallons of Meguiars Gold Class shampoo. Not positive on the price, but I believe it is under $20. You could easily get 60 washes out of a gallon.
I purchased some DP Wheel Glaze a couple of weeks ago and have used it on two different cars. It is very easy to apply and a little goes a long way. I used the product that was stuck to the lid of...
But I can vouch that the turbo tool from my Dyson DC07 vacuum works with my metro vac. I have a few other attachments from other vaccums that fit the metro vac, as well.