UV rays are a great sanitizer, playgrounds are subject to sunlight daily, well practically daily.
The CDC said a grocery cart outside in full sun for 15 minutes killed Corona//COVID virus. Even a mask hung up inside was safe to reuse after 5 days, because all the virus died.
This entire pandemic is an ongoing learning experience that began in 1999; thus guidance changes quite often.
A comparison my SIL made was, suppose someone handed you a box containing all the parts to make a cell-phone, but no guidance; how long would it take you the first time? How about the 2, or 4th time?