Cleaning Question

Since our paid cleaner left last year, we have attempted to do the cleaning once a month relying on volunteers turning up on a Saturday morning. Sometimes we have a good number of folk - others we have just 2 or 3 and it is not enough to get everything done.

On Sunday I asked for suggestions on how we could improve things. Two people spoke to me after and said that Saturdays were not good for them. They would prefer an evening - perhaps before a meeting. Any other ideas? Which evening is best?