HELP me unclog deep clog in drain please!?

i have a deep clog on my kitchen sink. i have tried drano and liquid plumber and just recently opened the bottom and used a 15 ft snake and nothing...but it is still clogged i cannot afford a plumber please help me unclog it what else can i do? thanks (ps its an older house and i dont want to use alot of air pressure to blow it out because of age of home