one might wonder when it comes to the price of some descaler fluids of some coffee machine manufacturers, especially the famous capsule ones. Yes, I'm looking at George Clooney.
And here is how you can circumvent it before a warranty claim refusal due to the use of "wrong homebrewed" descaling fluids could happen:
1) get 50ml hydroxyproionic acid, 80% if you can afford it. It is known as lactic acid as well. Cheap.
2) mix it with 50ml plain water, ready.
What you get is 100ml of ready to use "decal fluid" like offered for an extraordinary price. Use it further as recommended in the relevant user manual of your machine. The recipe has been proven as rock solid since years and you really don't have to worry about any damage.
Note: when you can't get 80% concentration, use rule of proportion to finally have lactic acid around 40-45% concentration. i.e. if you can have only 60% lactic acid available (wherever you get it from - use search engine), you need to mix 67ml with 33ml of plain water to get 100ml of ready to use fluid and so on.
Well, those of you who will now recommend citric acid instead should really be aware that citric acid will corrode the often used aluminium pipes much more aggressive with no added cleanness and that's the reason by easy evidence, why warranty claims will be refused by the machine manufacturer after their inspection.
Enjoy next descaling procedure of your machine.