Please be honest guys is the smell strong or light?

Good morning, This product is a more medium scent. It does smell slightly of sulfur but the intensity really depends on the person. For instance I do not have a great sense of smell so this does not bother but but if you are extremely sensitive it may be too much. Overall we do not have a lot of people concerned about this item scent wise! Kind Regards, Customer Care

Should I use a cleanser like Detox to remove makeup then this after?

Definitely. This cleanser is Not a makeup remover. Directions say to apply on clean skin. I use makeup removal first to completely expose my skin to the treatment. On as side note it is important to rinse this creme off very well. It happened to me that I had some left over on my neck and I didn't notice. My skin got irritated for days.

What is the amount in the tube (1oz, etc)?

The EradiKate Cleanser is 4 Fl. Oz.

Is this non comedogenic?

It does not specifically state that it is however it has many qualities and pure ingredients so educated guess would be YES. My daughter now only uses this. She's tried many that irritated her skin & did not clear it up. We did the whole Proactive treatment as well and she got better results with Kate. But everyones skin and body's chemistry is different. Just give it a try.. for at least a few wks before comparing to other products you might've tried. Also, remember not to try one after the other instantly. You'll only harm your skin(& wallet ;) ) Good luck