My boxer had surgery last friday to remove a lump that was close to his armpit and the incision is looking a little pussy in one spot. He's been taking an antibiotic clavamox(1000mg/day) for 5 days now and is also undergoing chemotherapy, so his immune system is lowered. Anybody know what I should be cleaning the incision with? Mild soap, a pinch of salt? He goes back to the vet friday but I would like to do something about it before then. Thanks