Where Can i auto alch/ Curse without randoms?

I'm currently auto casting alch/curse on the zammy mage at varrock castle. But i hate having to babysit because of all the randoms.

I went to the tzhaar fight caves.( no randoms) Except even with -58 magic attack i never seem to splash. So i can only cast 1 spell like every 20 seconds.


Does alching in pc boats still work?

 

Alching in PC boats should still work.