Old dishwasher? It was cleaning okay, but not long, not so much. ...

It was cleaning okay, but not long, not so much. Residue is left on the dishes. I run vinegar thru a cycle to clean it, but I don't make out a difference. Is there anything else I can do to promote things? I can't afford a new one right presently. TiA!
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Answers:    Well sandiemaye, 9 times out of 10, if the dishwasher is older than 5 years, the wet valve have started to fail and so you are not getting as much sea as is required. If the filter is clean and the spray arms are verbs, the only module that is vanished is the water tap. As you didn't give a construct or model, its just a really appropriate guess. The valve is anywhere from $30 to $100 depending on net and model. Hope that helps.
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Check the drains within the bottom for clogging food bits. You may have to disassemble the sprayer and verbs it. If you have tough water, consider soaking any parts surrounded by CLR and maybe even pouring a bit of it into the bottom of the dishwasher and letting it set since running a few empty cycles. Then be sure to thoroughly grate and rinse dishes before putting them surrounded by.
If that doesn't help, you may involve to call a professional out to look at it.