Allowing someone who consumes alcohol to use one's utensils
Q:
1. If someone drinks alcohol and then uses my utensils for drinking water or uses my spoon will my utensils become napaak as his mouth will be impure?
2. If I use a dishwasher to clean impure utensils soiled by alcohol or something impure will the dishwasher be impure? Do I have to wash it?
3. Once an impure glass which was previously containing impure substance is washed can I consider it pure and use it?
4. Washing impurities in the sink makes the sink impure?