I just wipe it out with a paper towel and water.
if a disease killed the fish then the fish was already sick with the
disease, it was more likely bad water quality (ammonia/nitrite/temp) or
incorrect feeding that killed it.
Also not many diseases handle the bowl merely being dried out or being left
setup without a host for 2 weeks
at least then the bowl may have been matured a bit

sorry to sound harsh but yea relax

"Nicki Sinclair" wrote in message
news
I had a betta fish and it died. I want to get another but know I must clean
the bowl and gravel before putting a new one in it. What is the best way to
clean these so they are free of anything that might have killed the
previous fish?

Thanks in advance

Nicki