No. The transmitter is hermetically sealed. You could drop the thing in a pool of blood and it would be fine. Assuming you subsequently cleaned the contacts.
Cleaning the transmitter contacts with an alcohol wipe has also been our process.
With the G5, you can easily pop out the transmitter on Day #5, clean the transmitter contacts, let it air dry a few minutes then pop the transmitter right back in. See if things improve. For us on the G5, sometimes that would help and sometimes it would not. Always worth giving it a shot as there is no downside.
The accuracy issue with your current sensor has nothing to do with the previous sensor.
And we have just learned how to pop out the G6 and put it back. Just tried it for the first time as practice and it worked awesome !!!
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G6 Transmitter removal from active sensor