Very 'low end' fork, bottoms are pinched at axle point, so no access there. Is there a way to clean, adjust these or is fork replacement my only option?
Low end forks are generally not repairable. The primary reason is that spare parts are not readily available. They can however be serviced. The labor involved would make it prohibitive to pay for the service as it will likely exceed the forks' value. Most can be disassembled, cleaned and greased. Remove (read this as pry) the plastic caps on the upper legs. With a flashlight you should see an allen head screw (5mm head) very deep in the fork. To loosen it requires either a very long wrench or a 3/8 drive allen socket and a long extension. Back off both screw evenly keeping track of the number of turns. Back off the screw until the lower section separates. You can clean any rust from the section and apply a general purpose grease to the moving parts. Then reassemble tightening the screws the same number of turns they were loosened. Just remember this is just service not a repair. Any parts that were worn are still worn.