yellow spotted leaves

hi i'm posting this topic for a friend as he doesnt know how to use a computer and well he doesnt have 1 either lol

ok here is the problem he has 5 plants set up in his grow room 2 california orange and 3 shitfaced and some of the leaves on all the plants have yellow spots on them kinda like it has yellow measles i dont have a picture yet as i didnt take my camera to his house i will try and upload some [ics later once i go round all advice is appreciated thanks in advance

Marijuana Plants Problems - Yellow Leaves, brown spots, nutrient shortage etc.

Read that link and then FLUSH them good with plain water for a few days, is my guess.

ph issues?

maybe spider mites look under the leaves see if you see a web or little green buggs?