is there a fuel additive/cleaner that everyone recommends?

[AGRORB]

STP Fuel system cleaner once a month
STP Octane boost at every fill up on Shell V-Power 95 or Mobil 98

STP Injector Cleaner once every 2 months

Has actually made a noticeable difference to my tired old L20E...

[Skibum291]

Bg 44k.

this- hands down - ugly can, expensive, but worth every fucking penny

[capiton23]

seafoam hands down. only thing cleaner i sold when i sold parts, mainly because i was the only one who could explain how to use it lol