[Roadsters] Marine Clean substitute/replacement?

[Tim]

A friend gave me some Marine Clean to use as part of the POR15 rust 
repair/proofing process on my Roadster. I had enough to clean and finish the 
inner fenders but don't have nearly enough left to do the outer fenders when I 
get them back from the shop where they are being stripped. 
 
I tried to order more from the web site and had all kinds of problems with the 
web ordering process. I did finally manage to place an order but now cannot 
confirm it as I am not able to log into the web site AGAIN (same as last weekend 
started out). I am afraid the order did not get placed even though I have a 
confirmation number. Even if it ships tomorrow I will not get it in time for the 
weekend. 
 
So, finally my questions: Can Marine Clean be bought "over the counter"? If so, 
where please? I have not seen it at my FLAPS. Is there something else I can buy 
OTC that works as well or better? 
 
sorry to be so verbose. I needed to vent as well as ask for info. 

PEACE :-)

Tim