Dad's laundry: How should we proceed?

I've posted before about my dad. Here's a brief summary of the situation. We've been assisting him for over three years now. He lived with us for almost ten months while recovering from serious health problems. Now he lives "independently" in a senior residence with a great deal of help from my husband and me.

Last May, we finally managed to remove one of our responsibilities: Dad started doing his own laundry. This came about because I had surgery and we needed a break. Our plan had been for Dad to pay to have his laundry done at the senior residence, but he refused to spend the money and instead started washing everything himself. (At most, it's only one load per week).

Now he's trying to give back the task, and he's using a variety of tactics to make it happen. My feeling is that we have done everything else for him and if he won't pay to have the laundry done, he'll have to continue to do it himself. Is that an unreasonable approach? I told him again today that if doing the laundry is making him tired, he should make use of the laundry service instead, but he came up with more excuses about why that wouldn't be a good idea.