1. yes it is dangerous b/c it restricts airflow which leads to overheating
2. open the case and wipe them off with any type of towel/paper towel
3. big time
4. just check at least once a year to make sure it is good, i dont recrommend the commpressed air b/c for some reason there is moisture in it, dont ask why but when ive used it, it leaves a type of liquid
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