How do I keep my dental implants clean and free of infection?

Q.
Hello,
I am seriously considering to undertake All on 4 teeth replacement based on what I read in your article here.
I have 73 years and after the war in Europe the only dental treatment in my region was tooth extraction mostly done by general MD or DIY..
By the age 20 I had most of my back teeth in the upper jaw and in the lower jaw missing.

Thus my jaw bone was not stimulated for over 50 years.
I am retired now and wear dentures.
In the lower jaw I managed to save 4 teeth in front. Dentures are now in need of repair.
I am wearing full denture in the upper jaw and partial denture in the lower jaw.

Have a question about dental hygiene after
All on 4 procedure is completed..
How do I clean those implants to prevent infection and loss of stability of the implant.
Even if implants are from special metal, bacterias can and will collect around implants and cause damage and cause periodontal disease around implants. Are there special techniques and tools to clean thoroughly at least once a day and preferably every time after eating sweets.
Implants will be covered completely covered and invisible and impossible to clean unless I go to a Clinic where they will be able to remove dentures to expose implants and that will significantly increase cost clinic to write a brief article about this important issue.
Many thanks for your help to clarify the maintenance procedures after All on 4 implants are placed in mouth.
Sincerely