bugs / garlic treatment question:

well first thing is first this is my first grow and i have bugs on 1 of the 2 of my plants they keep eating the leaves from outside to inside on all lvls theres nothing there in the morning no eggs/bugs anything i come home like a little bit of like 3 or 4 leaves is eaten and still no eggs/bugs i found a grasshoper on there 1 day and he quickly got banished to grasshoper afterlife bc i still dont know whats eating i found a beetle that was blood red and looked like the beetles u find on a screen door at night time ya know? idk if either of them could be it and for the million dollar question i heard of this garlic treatment that is supposed to work my aunt used the treatment on a bunch of her plants (not the kind where talking about) and it killed them all.... now i read in threads people say to use garlic and it works blah blah blah but nobody has said how much? can you use to much? are other plants more prone to dieing from garlic treatment than mary jane plants? if anyone could clarify any of this for me it would be fantastic.

PS- i have checked the bug forums, guidlines, and done a bunch of research but the symptoms unfortunatly seem to be for a wide variety so i cant come to a conclusion its like a drive by bugging they eat and leave with no trace left behind really boggles my mind hah thanks.

yea i never did hear how much garlic either. probably just get a couple cloves to each plant... or you can try a solution of rubbing alcohol and water. dilute it with about two thirds water and spray it on your plants. it will kill and all bugs... and yea grasshoppers can be a huge problem. they can eat ur plants right through the stem