I also used Bentonite Clay for the spidey bite. It is great at drawing out infections. The reason that I did not include it for an MRSA type infection is that I found it really tricky to keep the bentonite clay from drying out the rest of the concoction I made. Even though I diluted it to an almost runny consistency with colloidal silver, it turned rock hard in fairly short order. Once the mix dries out, the CS (and likely other ingredients) are not doing the job nearly as well as when they are kept moist.
I used my salve-type mix with a guaze bandage poultice style. I suppose one could use a cotton ball or more guaze folded a few times and then keep applying silver via a dropper to keep it from drying out like mine did.