Are there any surfaces I shouldn't use the Cleaning Gel on? Do not use on high-temperature items. Do not use on minuscule crevices like headphone jacks or speaker grills. Do not leave gel on soft surfaces for too long; this may lead to bonding and unwanted residue. Related articles What are the different adapters for? Can I run the unit for a long period of time? What is the cleaning gel made of? Can I power this unit with my 24VBAT-XR8? How do I maintain and store my ATJ-CA100?