Why are lemons good for cleaning?

Lemons are high in citric acid, lemon juice is one of the best natural cleaners due to its low pH and antibacterial properties. Lemons also smell great and aren’t likely to cause damage to materials around what you are cleaning such as fabric or wood.

Is this more effective than Calamondins or almost the same?

They are almost the same but lemon is known to have a good scent than Calamondins.