Some methods can leave behind salts or sludge highly concentrated with radioactive material and other contaminants that can be dangerous to people and aquatic life if they get into waterways.
Texting, phone calls, and other indirect methods can leave room for misunderstandings, so you're better off telling him in person.
However, solely depending on automated methods and software can leave many reads spanning insertions and deletions (indels) misaligned; therefore postreviewing the data for mismapping is always a good practice, especially in the candidate regions.
The wipe method can also leave undesirable residue... some wipes are meant for disinfecting... and will leave a slightly oily feeling on the toy.
This method of asking out can leave a paper trail that may or may not come back to haunt you, proceed with caution.
Alternatively, you can leave a personalized message following the "Feedback sandwich" method (praise-gentle guidance-praise) described.
The problem with this method -- which still has its loyal advocates -- is that it can leave a big scar and cause bald patches or numbness.
