That's a good question. I have never cleaned off the sap to see if the spike produces more sap or not, but the sap does attract potential bugs. You may want to clean the new sap off.
Out of curiousity, have you checked Ray's website for home remedies in regards to thrip since that seems to be the concensus? It's FirstRays.com. He's got some really good information in there, just click on the "free info" tab on the bottom of the page, then scroll down to the heading "Pests and Ailments" and click on the appropriate link.
Glad to hear they appear to be almost all gone! Keep us posted!
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