Sometimes head cleaning tapes work and sometimes they don't. You can keep running it through. For what it would cost to get it cleaned you can easily buy a better one from Craigslist, a thrift store, the newspaper, etc., so you've got nothing to lose.
90% of Magnavox VCRs are Funai, the cheapest VCRs made.
It looks like it needs cleaned. If it's a 4-head try this, whatever speed that tape you used is try one in another speed, if it's SP try EP and vice versa. 4 head VCRs use different heads for SP and EP and sometimes only one of them is dirty. It won't work with a 2-head since they use the same heads for both speeds.