@mvbergen - I can't help thinking your two posts belong somewhere else. Iran? Pakistan? Not mentioned by the OP in his question. If you agree perhaps you can delete them both as distractions.
@johnkelsall4293368
My wife and I plan on traveling through India in the near future.
When, exactly? If the near future means April and May it will be blisteringly hot on the northern plains. If the near future means June-October, it will be monsoon time. And how long do you plan to travel for?
Using trains and public busses.
Trains are fine - buses are really the option of last resort.
Has any one any advice.ie. How easy is it to get safe clean accommodation.
Well, you need to define clean. Even in mid-range hotels, the sheets and the towels are not going to be as clean as yours. They will have been laundered, but you should really expect grey instead of white; and stains aren't uncommon.
Has any one any advice. Places you must visit.
That entirely depends on your interests, and the time available.
The question always is, what are you interested in? What do you want to see, do, and experience on your trip? Because that determines where you go. Forts and Palaces? Temples and Monasteries? Ancient Ruins? Big cities? Shopping? Beaches? Hill Stations? Boat Cruises? Art and Craft? Mountains and Trekking? Wildlife Safaris?
Hampi https://www.lonelyplanet.com/india/karnataka/hampi
Agra / Taj Mahal https://www.lonelyplanet.com/india/uttar-pradesh/agra
Kerala backwaters https://www.lonelyplanet.com/india/kerala/alappuzha-alleppey
The Golden Temple of Amritsar https://www.lonelyplanet.com/india/punjab-and-haryana/amritsar
Delhi https://www.lonelyplanet.com/india/delhi
Jaisalmer https://www.lonelyplanet.com/india/rajasthan/jaisalmer
Varanasi https://www.lonelyplanet.com/india/uttar-pradesh/varanasi
Ajanta Caves https://www.lonelyplanet.com/india/maharashtra/ajanta
Mumbai https://www.lonelyplanet.com/india/mumbai-bombay
Khajuraho https://www.lonelyplanet.com/india/madhya-pradesh-and-chhattisgarh/khajuraho
Gompas of Pelling https://www.lonelyplanet.com/india/sikkim/pelling
Has any one any advice. How much money to allow per week.
Famously you can probably still get around India on $200 a week. I wouldn't, but it can be done.
Has any one any advice. Best guide books.
LonelyPlanet of course.
https://shop.lonelyplanet.com/categories/india