Do your best to not handle your frog. I actually started leaving my frogs in the tank undisturbed and found it to be quite effective. CLEAN AROUND YOUR FROG. If you NEED to remove the frog for ANY reason...
Where nitrile surgical gloves and make sure they are wet. Prior to putting on the gloves wash your hands with non-sented anti-bacterial soap. I use DIAL original (orange color). Your hands are abrasive to the frogs skin and can harm the frog leaving (invisible to human eye) abrasive tears in the frogs belly giving bacteria a chance to enter the underlying skin layers.
Every 3-4 days I clean out all the POOPS / Dead crickets from the enclosures while working around the frogs.
Once a month a do a full breakdown (removal of the frogs in quarantine tank) temporarily and Use dial Antibacterial soap and scrub the entire enclosure top to bottom. Haven't had a problem since I started doing that. I also use antibacterial soap DAILY when I clean the water dish out. Every morning I wake up to POOPS and skin layers in my water dish. Rinse everything thuroughly to get any soap residue off and rinse with dechlorinated water. This system works great for me since I used potted plants in my tanks and washcloths or paper towels as my substrate instead of soil/moss to keep bacteria levels to a minimum. Washcloths hold the moisture in better than the paper towels. Lynn uses a Fleece substrate which has proven effective as well and washable =). Hope this helps.