After 35 years since playing with Lego for the first time I am back into bricks as my two sons begin their training as 'master builders'. This last week we've just reclaimed a heap of boxes out of storage and from them have so far found enough lego bricks to fill six 5litre containers sorted into black, (old) grey, yellow, red, blue and white bricks plus small containers with mini figures, figure accessories, small pieces and technic bits.
Everything that has come out of storage was dirty (stored in a barn on a farm) and the box discovered had an open top so the contents was very dirty. I've spent every evening for the last week after the boys had gone to bed hand washing with a toothbrush each piece and leaving the to try. What a mission.
More stuff is still to be found including road and lunar base plates, floating ships (found the weights but not the hulls), light and sound components, plus more bricks and mini figures. Hopefully there will be some instructions in the boxes too. We're sure they were all kept.
All of the stuff dates from the 1978 sets onwards. It has been a real trip down memory lane looking through the pieces. The sets include many of the early castle and town sets including the Castle (375) and Town Square (1592) and various space sets too. There are some bits we just haven't worked out yet too.
This is a great forum - thanks for the all the information. I shall post up as we re-build stuff over the coming years. Some of the bricks have faded as described by others. I shall be trying the hydrogen peroxide solution (rather than gel) described on the http://retr0bright.wikispaces.com