Leaky pen? Ink stains can be difficult to remove. Here is a very good website to guide you in getting out ink stains. It has specific instructions for different kinds of ink. https://spotremoval.coit.com/ink-stain-removal
Here is a methodical test made of eight homemade oven cleaning recipes. Very satisfying to one's thirst for scientific certainty.
World’s Best Oven Cleaner: 8 DIY Natural Oven Cleaners Tested
Here's an eco-friendly solution that beats out commercial drain cleaners. I just tried it. One cup of washing soda (or baking soda), one cup of boiling water, and a cup of white vinegar. It will bubble and sizzle.
Here is a very simple, very handy tool for the kitchen: a small whiskbroom to clean crumbs off of surfaces.