Make sure any detergent/addittive used is HE compliant.
This means baby washing and delicate detergents. How much detergent for each load? Use as little of it as you can get away with!
This depends on the hardness of your water and the soil in your clothing. If you draw Vancouver city water (some of the softest in the world) you will only need 1/4 of what the package states.
For most front loaders usually 1tsp-1tbsp and not much more.
The amount needed depends on how soiled the laundry is. If it’s more than just body oils then you might need more.
If suds bubble over the front loader’s glass window or all the way out the door onto the floor, or worse, remain at the end of the cycle, you are using way too much detergent.
There is such a thing as too much. This can damage the machine by washing out the bearings. Bubbles/residue left at the end of the cycle can leave you wearing the patch. Not a nicotine or birth control patch, but a detergent patch (head to toe). That can’t be good for your body. If you, or anyone in your house has a rash or sensitive skin reduce the amount of detergent used and/or use “extra rinse” feature. Wait up to a month for results. Switch brands if necessary. Look for a small dollop of bubbles in the window (~1-3 inches in size) this means you’ve used only a little too much.