Clean toilet after the holiday
When we go on vacation or just go away for a few days, I always put a small splash of dish soap in the toilet. This prevents the standing water from forming ugly edges. This saves you the tedious scrubbing when you come home.
In addition, I throw a Gebißreinigungstablette once a week in the toilet and wait about 2 hours until I press the flushing. They are cheaper and just as effective as the expensive tablets for toilets. This tip gave me our bathroom specialist when we have rebuilt our bathroom.