Thanks a lot EricF and chubbs1 for the quick replies on the topic, highly apreciate your comments and opinions on the matter. So EricF, before I got interested in a water remover fuel additive, I was highly researching for a complete fuel system cleaner and gas treatment, and I found Red Line's SI-1 Complete Fuel System Cleaner. It had great reviews, so I purchased (3) 15oz bottles. This will suposely clean my fuel system and intake valves, prevent rust in tank and fuel lines and increase fuel efficiency. Now I have not use it yet because I just got it from the USA. I wanted to combine the mentioned benefits of Redline SI-1 with the water absorbing properties of 99% Isopropyl alcohol, which is the main, 99% ingredient as per their MSDS, in iso-HEET ( a widely sold water remover additive). So EricF I had seen the Redline's water remover before, but in their MSDS it did not specify if it was methanol based or isopropyl alcohol based, which are the two most used or that I have read about, main ingredients in water removal additives. From what I have read it seems like methanol is stronger in eating away the rubber from the fuel lines and injector seals and supposely isopropyl alcohol the other ingredient used in these products, does not seem to have a bad effect on the fuel system, in terms of corrosion. So chubbs1, I checked out the StarTron Tank cleaner MSDS, so the main ingredient (95 % w/v) is the solvent Naptha, which is an aliphatic petroleum destilate. That will be a great option for my little experiment here, but unfortunaly bringing stuff from the USA for me has been a little dificult and expensive, especially for tha kind of subtances with hazzardous handling. Now 99% Isopropyl Alcohol is also a petroleum destilate, which comes from the combination of water and propene (a hidrocarbon produced from fossil fuels—petroleum, natural gas, and, to a much lesser extent, coal). So based on this, I thought of the use of 99% Isopropyl alcohol to use as StarTron Gas Tank Cleaner (of course different formula but similar mechanism of action) and Red Line SI-1 Complete Fuel System Cleaner (since this product I was able to get it shipped to Costa Rica without special handling issues), to provide a possible small quantity water prescence in fuel tank and system removal and a good complete fuel system cleaner for a more efficient fuel combustion and clean fuel lines and intake valves. Any further comments or opinions highly apreciated