If they seem chemical, or have a bad smell, check if the washing machine washes well, or use another program to wash them more, or a short program to wash them again, only with water.
And importantly, clean your washing machine. The residue from the detergent and the grime will slowly build up, so it’s important to at least every few months run a cleaning cycle (95°C or whatever the self-cleaning cycle of your machine is) with an actual machine cleaner and no clothes.
Before that cycle, manually clean some parts like the detergent fill-in area and the door. Some of the remaining dirt will be washed off by the cleaning cycle then.
And importantly, clean your washing machine. The residue from the detergent and the grime will slowly build up, so it’s important to at least every few months run a cleaning cycle (95°C or whatever the self-cleaning cycle of your machine is) with an actual machine cleaner and no clothes.
Before that cycle, manually clean some parts like the detergent fill-in area and the door. Some of the remaining dirt will be washed off by the cleaning cycle then.