Macro for deleting autofiltered rows

Having decided that I can't ignore macros and VBA any longer if I want to progress my Excel skills, I have recorded a macro today for the following scenario.

I receive a raw data file from the mainframe which I open in Excel and save and a worksheet. Here's a sample:

PREFIX CUST.CODE BRANCH CAT DATE OPENED LAST INV.DATE
A1 A1ENTE 12 8 24/04/06 14/12/06 10,095
A1 A1TAS 85 8 12/05/05 13/12/06 4,890
A8 A80132 74 8 11/09/02 0
AA AAA24 29 8 1/01/86 13/12/06 5,812
AA AAAANO 58 8 27/07/95 22/09/06 1,239

My macro first inserts column A and adds a formula to enable me to easily identify cash customers. Next, it creates an autofilter on row 3, which contains the column headings, then filters by column A to delete all rows where column A = "A9"; then filters by column D and deletes a variety of category codes.

All of this is works fine on the current data file, but when I look at the macro code it refers to specific row numbers in the delete portions. I want to use this macro every month, but the row numbers in each category can change because the number of customers will (hopefully!) increase. Is there any way to make the macro delete everything selected by the autofilter without specifically referring to row numbers?