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I hate to do this but have you tried AMways concrete floor cleaner it has worked very well for me in the past and it is fairly inexpensive.
Gravel
F-250- 302 4 speed 1984 350,000 miles
I normally use the kitty litter method to get up the majority and then a good soaking with OXY Clean. Mix it strong and let it sit for a little bit then spray it off with a garden hose.
Russell
1968 F250 LWB 300-6
FORD=First on Race Day
#88 Dale Jarrett-9th in 2002
#21 Elliott Sadler
#97 Kurt Busch-3rd in 2002
#28 Ricky Rudd-10th in 2002
personally, i like our 580 case backhoe..... makes short work of any driveway........ course ours is dirt, but if your's is paved, i could soon fix that... hehe