make clean,
clean remove unwanted substances from, such as feathers or pits; "Clean the turkey"
sanitize -
make less offensive or more acceptable by removing objectionable features; "sanitize a document before releasing it to the press"; "sanitize history"; "sanitize the language in a book"
modify,
alter,
change make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"