Cleaning

Shower glass

Distilled warm white vinegar + dish soap (Dawn specifically for some reason?). Let sit for half an hour, rinse off.
Let dry and scrape with 0000 steel wool (any other will scratch)

Drains

full kettle of hot water, pour slowly
if doesn’t work: 1/3 cup white vinear, 1/3 cup baking soda, mix and immediately down the drain. let sit for an hour, rinse with hot water
if it doesn’t work: drain snake https://www.bol.com/nl/nl/p/purepeak-ontstoppingsveer-geschikt-voor-douche-keukenafvoer-wc-wasbak-160-cm-gootsteenontstopper-rioolreinigersveer-afvoer-ontstopper-rioolveer-drain-cleaner-rioolontstopper/9300000154505518/?bltgh=iPIqf-RSZ4VS-wnp7v9JGA.nPMcpgyjtZBeqgFuDVdMMA_0_4.8.ProductTitle https://www.bol.com/nl/nl/p/mcdevens-ontstoppingsveer-10-meter-7-6mm-met-coating-rioolveer-rioolontstopper-rioolreinigersveer-afvoerontstopper-ontstopper-gootsteenontstopper/9300000165335623/?bltgh=jUPbLpf0f9XZNoJ5-oJBFQ.2_17.18.ProductTitle

https://www.bol.com/nl/nl/p/kreator-krt563003-ontstoppingsveer-ontstopper-10-m-lang-10-mm-o/9200000059381220/?bltgh=jUPbLpf0f9XZNoJ5-oJBFQ.2_17.20.ProductTitle

Ingredients

Companies refuse to disclose what’s in their cleaning products. But you might see “anionic” and “nonionic surfactants”.

Surfactants: cleaning agents, like soap. Chemicals with two opposing ends, one soluble in water, the other in fat. So it can help mix oil and water. When there’s liquid on top of oil, there’s a lot of surface tension, and surfactants can reduce this tension by mixing the two, helping wash away oily and water-based stains.

“Ionic”: charged. “Anionic” negatively, “cationic” positively, “amphoteric” both.

“Anionic” most frequently used, common being sodium lauryl/laureth sulfate, ammonium lauryl/laureth sulfate, sodium stearate, potassium cocate.
“Cationic” are more effective at killing microorganisms, so can disinfect
“Amphoteric” frequently in shampoos and body washes, least potent.

“Nonionic”: no charge. Less likely to form ‘soap scum’. Generally less effective, but less skin irritation.