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Yes. It is important to use a soft brush or an airline to blow any debris from around the spark plug holes, prior to removing the plugs themselves. As far as spraying anything into the plugholes; it should never be done in my opinion. Even to clean the threads.
In fact the only addtitve i would ever recomend would be redex, but that should only be used if you suspect serious gunge problems in your cylinders.
Personally - i prefer not to use any additives at all during plug changing. Any redidue that has built up over the years in your cylinders should be treasured, as it (in most cases) helps to increase compression.
Anyway - thats my two pence's worth.
Hope it helps somebody...
Tony - Volvo 440 1.8 - 1992
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