Rinsing the whole product when only the sleeve can take water. Svakom explicitly excludes damage from submerging non-waterproof parts from its warranty. Take the sleeve out first.
Using the wrong lube. Every manufacturer here specifies water-based. Svakom's manual for Alex Neo 2 advises against silicone-based lube, oils, lotions and hand cream, which break down TPE. On silicone sleeves, silicone lube makes the surface porous over time. Read more in which lube to choose.
Boiling the sleeve or putting it in the dishwasher. Arcwave states that its products must not be exposed to more than 45 degrees, Svakom gives 40 degrees as the upper limit for Alex Neo 2, and Satisfyer gives a storage temperature of up to 60 degrees. Boiling and the dishwasher are ruled out for all the models here.
Putting the sleeve away damp. A canal that hasn't dried is where bacteria and mould take hold. The routine for cleaning and drying is in how to clean sex toys.
Running a thrusting machine without a break. Autoblow A.I. Ultra has overheating protection that requires ten minutes' rest when it trips. Follow the manufacturer's instructions and never use the machine without a sleeve.