My plumber advised against chemical. Health hazzard one thing. Another u could be fucking things up further down the line creatung more issues. Not all piping can tahan those chemical.

Also dont get indon newbie plumber, they will just jolok and use plunger force the fuck out of everything without checking root cause. Most of the time they got no plubming knowledge, their best trait is willing to go dirty do stuff for u. Dont expect them to provide professional advice.

U really need to get ur hand dirty if u want to save $$$. I wouldnt bother with this and spend rm300. The amount is not big, even if u minimum wages also its like 1/5 ur salary. Thats why very important to save up emergency fund. Dont go YOLO BNPL evrything. Just make sure u hired proper plumber.

Malaysia is really one crazy country. Too many dumb dumb that cannoy weight their options.