For PCR and qPCR, you use filter-tips to avoid cross-contamination. For cloning, you can use regular sterile tips; cross-contamination is rare. No regular cleaning of pipet is necessary. But it is good to send it back to the company for calibration on regular basis.
Not affiliated with any company. Mention of a specifc product does not imply my endorsement of the product. No conflict of interest or guarantee to work on the advice given. Do as I say, not as I do. Not liable to the loss of your valuable samples.