having used many many chemicals over the last 20 odd years i can honestly say that hydradry extraction powder is one of the best products i have used. i've used it portables and truckmounts, and when i introduced it to a friend of mine who uses a portable he was well impressed especially on synthetics.
Last night we did some offices and used oj gel (very similar to citrus gel) and i can only say that while expensive it did the job that citrus gel is supposed to do or at least that is my oppinion, removeing bluetak with just a little aggitation.
great products in my oppinion.