Disappointed with Drano

My sink clogs about once a year. Typically it starts to drain more slow each time, and the water builds up. I have long hair, and I’m sure part of the reason it clogs is because of my hair. A friend recommended Drano gel to me. The idea is you pour it down the drain, let it sit and the gel helps dissolve hair or whatever it’s clogged with. Then you rinse with hot water and repeat if needed. I was disappointed with the results as I didn’t see any improvement. I even bought the big bottle!