So, after three hours of editing all of the old invoices that had sales tax associated with them I am now FREE of the sales tax debacle.  For anyone with the time and energy to do this, you have to run the sales liability report and be sure to run it for all dates.  Click on the amount listed for all tax at the bottom of the report and then you'll have to run it again for all dates. 

From there you'll have a list of the invoices that you need to fix.  After click on an invoice number, check on the green check mark for the sales tax, click it again to toggle it off.  Then you HAVE to click into another box on that same line until the checkmark turns from gray to disappearing.   You have to do that for each line that has sales tax checked. Once you've done that you can save changes. 

I had some pesky invoices where it didn't remove the invoice from the list.  I think if you have a sales product that was altered after the invoice was created it may cause an error in the method above.  If that happens, you'll have to go back into the invoice and re-create the offending lines and then delete the old ones.  They won't have check marks at this point, but if you keep track of what you're doing you can then save the updated invoice and it should come off the list.  I also trashed the extra line just in case when I had to re-enter things.  

Time permitting, this worked for me as I only had about 300 invoices to fix.  At best it takes 15-20 seconds for each invoice.  Multiple lines in an invoice make it trickier.  What can I say - I'm persistent and frankly pissed that I made such a stupid mistake by enabling sales tax in the first place.  When your liability report is empty, head back over to TAXES/Sales Tax and click on Turn Off Sales Tax.  Good luck!