Davidsss,
Crackiling records is not always grimne or dirt in the groves. Other things tha can cause crackles and things you can't really do anything about include:
Poor vinyl substrate. There were unscrupulously made LPs in the day using cheap vinyl and often contaminated vinyl.
Micro groove damage from a previous user who maybe handled albums poorly, had poorly maintained turntable and cartridge riding and damaging the groove. You can't see this damage with the naked eye.
Static build up and release as the cartridge pays. This is often a problem in drier climates as static build with lower humidity. You can try to do things to help reduces such static. Using a carbon fibre brush making sure you touch a metal object to ground yourself as you use the CF brush. You can use one of those static guns and also try to keep static from building if you live in a very dry climate buy employing a humidifier in the room.
