How can I clean out sediment from a 10 gallon electric water heater?
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See if these are enough to help you out.
https://youtu.be/TCFCwldQHAs
https://youtu.be/Hvaro5I1P_g
https://www.familyhandyman.com/plumbing/water-heater/how-to-flush-a-water-heater/view-all/
https://homeguides.sfgate.com/dissolve-water-heater-sediment-33500.html
I think you will find it’s not worth it to clean a ten year old water heater. A good water softener ((not one off the shelf) will help your softener last for many many years.
You should drain your water heater at least annually. That will remove the sediments and prevent build up.