This product lasts incredibly long, doesn't seem to "go-off", is inexpensive (about R26) and is very effective. With the essential oils, natural active ingredients and powerful salicylic acid it decreases inflammation and it dries out the spot very quickly. I would just need to dab on once or twice for it to be effective. We always take it along on holiday because the bottle is so teeny tiny. The only thing is the liquid is very "runny" so to concentrate it on a spot, a cotton bud may be used.
Zoits (as the hubby and I like to call them) better beware because this product delivers on it's promises. It has been around for ages and I can't remember how long I've been using it against an unexpected Zoit Ambush.