Civic 99 won't start after a month in the gaurage
I have a honda Civic Ex 99 and I had to go on a vacation for 4 weeks, by the time I came back I found a flat front tire on the passenger side. I have replaced it with the spare and tried to start. The engine basically cranks up but it won't start. AAA guys came over and tested the battries and everything seems fine. They have mentioned that since its been a month I have started, there could be a clog in the fuel supply. Some one was suggesting that there is some kind of liquid I need to inject into fuel tank to purify the gas.
Please suggest to me, what needs to be done in this situation.