Is there any way to auto-apply the unapplied receipts for a customer?

Hi,

Please help us on the below issue.

We have many customer has many invoices, credits ans also unapplied receipts.

So is there any way to auto-apply the unapplied receipts for these customer ? like a request or any way.

We want to do this to avoid going on each customers and apply their receipts individually, we want to do them in one shot. 

Thanks

George