Disposable Razor For Sweaters

I am a homemaker for the elderly. While at a client's house on Tuesday, I saw her "shaving" a sweater she wears. I used to have a sweater shaver, but what she used surprised me. She uses a disposable razor to do this. Went quickly and did a great job. She said "poverty makes you creative". Seemed to work much faster and better than the sweater shavers you can buy.