This would be a start (priced at cleanyourcar.co.uk):
Huge 38" x 28" Microfibre Drying Towel HUGD1 £8.47 £8.47
Sonus Sheepskin Wash Mitt VK-103 £6.77 £6.77
Meguiars Shampoo Plus D11101 £12.72 £12.72
Subtotal: £27.96
VAT: £4.89
*Shipping: n/a
Basket Total:
£32.85
Then if you want to go further look at getting meguiars quik clay kit, and probably some auto glym super resin polish would be your best bet for your needs. You'd also need a foam applicator pad and microfibre buffing towel for the polish. On top of that you could add a wax or sealant, but would need to know the colour of the car to be more specific with that. For the black plastic, the best product is 303 Aerospace Protectant