Yes in the final rinse of a normal wash with clothes etc use a small amount of white vinegar eg tablespoon or so every wash, just put it in where you normally add softener (you know you shouldn’t use softener 
) . It will help neutralise any soap powder residue left behind in clothes and if used each wash will help keep build up under control. Or just make a Tub Clean cycle a less frequent one and add a cup or two of vinegar to the wash cycle when that tub clean is on. If you have areas you want to water run the waste water hose outside to those areas by adding an extension hose (example of one https://www.bunnings.com.au/kinetic-4-1m-grey-pvc-washing-machine-and-dishwasher-outlet-drain-expandable-hose_p4920263) or to a drum so it can be used on the areas.
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