This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to clean a cricut mat 
Give your mat a light cleaning when it loses some of its stickiness. 
In order to keep your mat sticky for as long as possible, it's a good idea to clean it regularly. First scrape it off with a plastic scraper, either cricut brand or any other type of hard plastic scraper.

Pick from: 1. If the scraper is hard enough, it will come off relatively easily with little problem. Examine the mat periodically to check for stickiness.; 2. Clean the mat once every two weeks. You should do this every two weeks.; 3. Rinse the mat under running water until it is completely clean. Sand it to have a soft, lint-free surface.; 4. Then wipe an alcohol-free baby wipe or roll a lint roller over the surface. A lint roller is usually stickier than the mat, so it's able to remove any debris that is stuck to the mat.;
The answer is:
4.