I'm a vet nurse who has extensive difficult to heal and specialist wound training. I was taught most things you put in a wound except for saline solution or things designed to go in wounds, will destroy wound healing and can make it take weeks to heal a wound that should take days to heal. I shudder at the thought of citronella in a wound- poor granulation tissue!
I have healed horrific road traffic accident wounds, which are mega contaminated etc, by using good old fashioned Manuka Honey- medical grade- at least grade 15+(from health food shops or your vet!) . I bet u any amount of money it will heal it faster, with less scarring and less pain as its naturally antiseptic (scientifically proven!). I would clean with a saline solution- flush with a big syringe (the solution to pollution is dilution) with a 21g needle on it- DO NOT RUB the wound as u will rip off the new healing cells. then slather it in Manuka. The flies cant get to the wnd as its completely covered in honey.
And NEVER put Hibiscrub or iodine on a wound!! And any vet that tells you to do it is a twit! (they also have like only 1 day at uni of wound care and bandage lessions....) vet nurses have months!
Glad to hear lambie better!