After a while, I have managed to receive the products themselves. Therefore, it is better to mention what sits inside these products, directly reading from the packages.
The descaler is mostly citric acid as Evan noted. (I assume the percentages are by volume. Nothing noted, though.)
- 58±2 % citric acid
- 23±2 % maleic acid
- 23±2 % sulfamic acid
The grease cleaner is quite complex and its ingredients are noted without percentages. See here. (This cleaner is said to be ideal for thermoses and flasks, too.)
- Sodium carbonate
- Sodium sulfate anhydrous
- Sodium percarbonate
- salt of phosphonic acid, organic
- Polyethylene glycol 8000
- Citric acid, anhydrous
- Potassium peroxomonosulfate