take a wire wheel to it afterwards, or a metal brush and take off all the bolt threads. lots of people have done it this way as this is how it is described to do it on LS1 how-to. it is you motor and is up to you, but this is the free way to do it.
i mean if you are really that worried, send me your address, i will go dig up the one i used, i am sure it is clean by now
<Build Page> / <FQUICK> / <YouTube Page> 1999 Trans Am WS6 6 speed PRC Heads 11.2:1 CR, LSR cam, Yella Terra Ultralights, FAST injectors, TSP oil pump, FAST 92/92, QTP, Magnaflow, LS7 Clutch, FTP 98mm lid, Z06 MAF, Viper spec T-56, Pro 5.0. CTS-V Brembo Brakes, BMR Suspension, Tune from Ellis@Speed Secrets 2007 Ducati Monster S2R 1000 Full Arrow Carbon Fiber Exhaust, 14t, K&N, Ducati Race ECU, Brembo Goldline Brakes, Slipper Clutch
Grooving my bolts took nothing out of the holes. I ended up buying the thread cleaning tap from ARP and removed a lot of old tread lock that the bolt didn't grab. I even had to re-vacuum out the holes to get the additional thread lock dust that fell to the bottom. I was really meticulous about this as stripping a hole was my single worst nightmare. My heads went on yesterday.....flawlessly.
And yes, they seem to be the only people that make the tool. Don't use any tap because most all will cut threads (remove metal) vs just clean them.