Here is a good website that will give you step by step instructions on how to clean your painting.
If you need any more information please let me know before you accept.
I'm not absolutly sure but yes I think that the proceedures outlined on the website can be applied to acrylic also.
I am just home for some lunch. I will research this further when I return this evening and post the results here for you.
It appears that I was wrong in assuming that the care of acrylic paintings was the same. It is not. Acrylic has some difficult, to say the least, care problems. Cleaning the paintings is even more problematic due to the softness of the paint, and the ease with which the appearance of the painting can be altered if done improperly.
Below are the two best articles that I could find about cleaning acrylic paintings. The first is a bit long winded but has some excellant technical advice. The second link is more descriptive and written more for the lay person.
Between the two of them I believe that you will be able to formulate a good plan as to how to proceed with cleaning your painting.
If you would like further information please let me know and I will see if there is more available.
Thank you for accepting and the nice bonus also.
Best regards; The Home Smithy